<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>联系html</title>
    <style>
        .container{
            background-color: skyblue;
        }

        .header{
            width: 100%;
            height: 300px;
            background-color: slategray;
        }

        .content{
            width: 100%;
            height: 300px;
            background-color: sienna;
        }

        .footer{
            width: 100%;
            height: 300px;
            background-color: greenyellow;
        }

        h1{
            text-align: center;
            line-height: 300px;
        }

        .box{
            border: solid 1px gray;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="header">
            <H1>哈哈哈哈</H1>
        </div>

        <div class="box">dsaf</div>
        <div class="box">sd</div>
        <div class="box">dsf</div>
        <div class="box">dasf</div>


        <div class="content">

        </div>

        <div class="footer">

        </div>
    </div>

</body>
</html>